Improvement in the valve-gear of steam-engines



Y UNITED STATES PATENT OFEIcE.

.d JAMES MALOY, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN THE VALVE-GEAR OF STEAM-ENGINES.

Specification forming part of Letters Patent No. 48,418, dated June 527,1865; antedated June 9, 1865.

To all whom it may concern:

Be it known that I, JAMES W. MALOY, of Boston, in the county of Suffolkand State of Massachusetts, have invented certain new and usefulImprovements in Steam-Engines; and I do hereby declare that thefollowing description, taken in connection with the accompanying plateof drawings, hereinafter referred to, forms a-full and exactspecification of the same, wherein I have set forth the nature andprinciples of my said improvements, by 4which my invention may bedistinguished from all others of a similar class, together with suchparts as I claim and desire to have secured to me by Letters Patent.

The present invention relates to certain new and useful improvements insteam-engines, having for their object the regulating of the amount ofsteam supplied to the cylinder, with l `a view to adapting the powerfurnished to the actual Work to be performed or the load upon theengine.

My improvements are applicable to the Wellknown link-motion, or motionin which the medium of communication between the `valverod andeccentric-rod is by means of a link, the leverage of which can bechanged at pleasure, and consequently the play of the sliding valvevaried accordingly. This link has hereto- Y fore been operated byseveral different methods, but principally by means ofthe regulatoritself; but in these cases it has been found very dif- `fcult to actuateit successfully, because suflicient power could not be furnished by suchmeans, the force furnished by the regulator or governor, for instance',bein g insufficient to give the link its necessary motion.

My improvement consists in giving the required play or motions to `thelink by means of a small auxiliary steam chest and cylinder fitted witha proper valve and piston, respectively, the valve being actuated bymeans of the vertical play of the regulator-rod.

The accompanying plate of drawings represents my improvements.

Figure l represents a top view of aV stationaryengine. Fig. 2 is a sideview of the same. Fig. 3 is a detailed section of the saule, taken intheplane of the line A B, Fig. 2.

a a a in the drawings represent the bedpieoe of a stationary engine. b bis the cylinder; c, the piston-rod; d, the connecting-rod, and e theiiy-wheel.

fis the main steam-chest, in which slides the upon a pivot, Z, therebyincreasing-or diminishing the leverage that the eccentric-rod h has uponthe valve-rod t in the same manner as heretofore used in other engines 5but this link 7c, instead of reeeivin g its motion from theregulator-rod m, or from any other moving y part of the engine, isdriven by a piston-rod, n, attached .to the link k at the point o. The

piston-rod n travels up and down in a small steam-cylinder,p, which issupplied with steam from a steam-chest, q.

ln the steam-chest q works a valve, r', which opens and closes the portsthat communicate with the cylinder p at the proper times. The

- valvep is fastened to the lower end ot' the regulator-rod m. Thus itwill be seen that according as the balls of the regulator s s are moreor less extended, in accordance with the load upon the engine, the valvep `will admit more or less steam to a the cylinder p, and through thepiston-rod a the link k will be more or less raised upon its pivot l,thereby increasing or diminishing the play ot' the sliding valve g, andconsequently supplying` the main steam-cylinder b b with a quantity ofsteam proportionate to the load upon the engine. It will be observed,therefore, that the play of the link 7c to effect this desideratum isentirely performed by means of the auxiliary steam-cylinder and itspiston, and that its certainty of operation is insured at all times,instead of being dependent upon the movement of the regulator-rod orother uncertain and inadequate means.

Having thus described my improvements, what I claim as my invention, anddesire to have secured to me by Letters Patent, is-

Actuatin g the link that forms the communication between theeccentric-rod and slidingyvalve rod by means of an auxiliary steamcylinder and piston when supplied with steam by the movement of theregulator-rod, as set forth.

J AMES WALE MALOY.

